| 摘要 |
A first AC power source comprising a fuel cell power plant (18), and a second power source, typically grid (10), are normally connected via a high speed isolation switching means (19) to provide sufficient AC power to a critical load (14). The fuel cell power plant (18) comprises a fuel cell (60) and a power conditioning system (PCS) (62) having an inverter (64). Power assurance means (65; 10'', 66, 64, 70; 74, 75) is/are operatively connected to at least one of the first and second power sources to enhance an even and continuous supply of power to the critical load (14). The power assurance means (65; 10'', 66, 64, 70; 74, 75) is/are operatively connected to the inverter (64) of the PCS (62), and may be one, or a combination of, a surge suppression means (65), a double-conversion power connection means (10'', 66, 64, 70) having a rectifier (66); and/or stored energy means (74), such as a capacitor (75). The power assurance means (65; 10'', 66, 64, 70; 74, 75) provide continuous quality power to the loads (14), even if the fuel cell (60) is not operating, and/or if operating transients might occur that would otherwise decrease the voltage to an unacceptable level.
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